Table 2.

“BIO” label table in joint extraction model.

Label	Description
B_CID_S	Head entity start label for chemical disease relationships
I_CID_S	Head entity middle label for chemical disease relationships
B_CID_O	Tail entity start label for chemical disease relationships
I_CID_O	Tail entity middle label for chemical disease relationships
B_GID_S	Head entity start label for genetic disease relationships
I_GID_S	Head entity middle label for genetic disease relationships
B_GID_O	Tail entity start label for genetic disease relationships
I_GID_O	Tail entity middle label for genetic disease relationships
O	No labels